865949 has 4 divisors (see below), whose sum is σ = 989664. Its totient is φ = 742236.

The previous prime is 865937. The next prime is 865957. The reversal of 865949 is 949568.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 865949 - 2⁴ = 865933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61847 + ... + 61860.

It is an arithmetic number, because the mean of its divisors is an integer number (247416).

2⁸⁶⁵⁹⁴⁹ is an apocalyptic number.

It is an amenable number.

865949 is a deficient number, since it is larger than the sum of its proper divisors (123715).

865949 is a wasteful number, since it uses less digits than its factorization.

865949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123714.

The product of its digits is 77760, while the sum is 41.

The square root of 865949 is about 930.5638075919. The cubic root of 865949 is about 95.3156261091.

The spelling of 865949 in words is "eight hundred sixty-five thousand, nine hundred forty-nine".